Abstract
Our previous studies indicated that high light induced significant photoinhibition of photosystem I (PSI) in the shade-establishing tree species Psychotria henryi. However, the underlying mechanism has not been fully clarified. In the present study, in order to investigate the mechanism of PSI photoinhibition in P. henryi, we treated detached leaves with constant high light in the presence of methyl viologen (MV) or a soluble α-tocopherol analog, 2,2,5,7,8-pentamethyl-6-chromanol (PMC). We found that MV significantly depressed photochemical quantum yields in PSI and PSII when compared to PMC. On condition that no PSI photoinhibition happened, although cyclic electron flow (CEF) was abolished in the MV-treated samples, P700 oxidation ratio was maintain at higher levels than the PMC-treated samples. In the presence of PMC, PSI photoinhibition little changed but PSII photoinhibition was significantly alleviated. Importantly, PSI photoinhibition was largely accelerated in the presence of MV, which stimulates the production of superoxide and subsequently other reactive oxygen species at the chloroplast stroma by accepting electrons from PSI. Furthermore, MV largely aggravated PSII photoinhibition when compared to control. These results suggest that high P700 oxidation ratio cannot prevent PSI photoinhibition in P. henryi. Furthermore, the superoxide produced in the chloroplast stroma is critical for PSI photoinhibition in the higher plant P. henryi, which is opposite to the mechanism underlying PSI photoinhibition in Arabidopsis thaliana and spinach. These findings highlight a new mechanism of PSI photoinhibition in higher plants.
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Abbreviations
- CEF:
-
Cyclic electron flow
- ETR:
-
Electron transport rate
- F v /F m :
-
The maximum quantum yield of PSII after dark adaptation
- MV:
-
Methyl viologen
- 1O2 :
-
Singlet oxygen
- O2 − :
-
Superoxide
- PSI:
-
Photosystem I
- PSII:
-
Photosystem II
- P m :
-
The maximum photo-oxidizable P700
- PMC:
-
2,2,5,7,8-pentamethyl-6-chromanol
- PPFD:
-
Photosynthetic photon flux density
- ROS:
-
Reactive oxygen species
- Y(I):
-
Quantum yield of PSI
- Y(II):
-
Effective quantum yield of PSII
- Y(NA):
-
The fraction of P700 that cannot be oxidized by a saturation pulse to the overall P700
- Y(ND):
-
The fraction of P700 that is oxidized by actinic light to the overall P700
- Y(NO):
-
Quantum yield of non-regulated energy dissipation at PSII centers
- Y(NPQ):
-
Quantum yield of regulated energy dissipation at PSII centers
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant 31300332 and 31670343), and an open fund from Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences.
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Huang, W., Yang, YJ., Zhang, JL. et al. Superoxide generated in the chloroplast stroma causes photoinhibition of photosystem I in the shade-establishing tree species Psychotria henryi . Photosynth Res 132, 293–303 (2017). https://doi.org/10.1007/s11120-017-0389-4
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DOI: https://doi.org/10.1007/s11120-017-0389-4